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JEE Main · 2022 · 27 Jul 2022 · Shift 1 · General Principles and Processes of Isolation of Metals

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Which of the following methods are not used to refine any metal?
(A) Liquation
(B) Calcination
(C) Electrolysis
(D) Leaching
(E) Distillation

Choose the correct answer from the options given below:
  1. (A)B and D only✓ Correct
  2. (B)A, B, D and E only
  3. (C)B, D and E only
  4. (D)A, C and E only

Answer: (A)

Solution

Refining is the final purification of a metal after extraction.
  • Liquation (A): a refining method (melting low-melting metals away from impurities).
  • Calcination (B): heating ore in limited air to remove volatile impurities — this is an ore concentration step, not refining.
  • Electrolysis (C): electrorefining is a common refining method.
  • Leaching (D): dissolving ore in a solvent — this is ore concentration, not refining.
  • Distillation (E): a refining method (e.g., for Zn, Hg).

Methods not used for refining: B (Calcination) and D (Leaching).

The answer is (A) B and D only.

JEE Main · 2022 · 27 Jul 2022 · Shift 1 · Single correct option

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